function fileChange(myFile,myImg){
    var reader = new FileReader();//定义文件读取流对象
    reader.readAsDataURL(document.getElementById(myFile).files[0]);
    reader.onload = function (ev) {
        document.getElementById(myImg).src = ev.target.result;
    }
}
function $(id){
    return document.getElementById(id);
}
function getQuery(variable) {//将id传送到新html页面
    var query = window.location.search.substring(1);
    alert(query)
    var vars = query.split("&");
    for (var i=0;i<vars.length;i++) {
        var pair = vars[i].split("=");
        if(pair[0] == variable){return pair[1];}
    }
    return(false);
}